$(document).scroll(
    function() {
        var b = $(document).scrollTop();
        if(b>=200){
            $(".navigation_bar").css("position","fixed");
            $(".navigation_bar").css("top","0px");
        }else{
            $(".navigation_bar").css("position","relative");
        
        }
})

$(".navigation_bar li").click(
    function(){
        $(this).siblings().children("a").css("border","0px");
        $(this).children("a").css("border-bottom","3px solid red");
    }
)

var flag = true;
$("#ulLi>li").click(function(){
    var current = $(this).index();
	var top = $(".gu").eq(current).offset().top;

    flag = false;
	$("html").stop().animate({
		scrollTop : top
	},function(){
		flag = true;
	});
})


